How can i create a cascade filter from the same 'a' and b' values as a direct filter.

Hi there,

I am currently figuring out filters. I have created a 5th order elipse filter with a direct form implimentation. I am curious as to if there is a 'simple' way to impliment the same trasnfer function in a cascade form (and parallel)

Thanks!

clc, clear all, close all;

data = audioread('Example.wav');
sample_rate = 8000;
nyq = sample_rate/2;
num_samples = length(data);
dF = sample_rate/num_samples;
f = -nyq : dF : (nyq)-dF;

time = [];
for i = 0:5/length(data):5-(5/length(data))
    time(end+1) = i;
end

fft_data = fftshift(fft(data));
figure(1);
plot(f, fft_data);
xlabel("Frequency (Hz)");
ylabel("Amplitude (uV)");
xlim([-4000 4000])


[b,a] = ellip(5,9.7,800,0.3);

for value = 1:length(b)
    b_quan(end+1) = ((round(b(value)*b_quan_val))*(1/b_quan_val));
    a_quan(end+1) = ((round(a(value)*a_quan_val))*(1/a_quan_val));
end

% %%%%%%%Direct realisation
output = filter(b,a,data);
audiowrite('Direct.wav', output, sample_rate);
figure(3);
plot(time, output);
xlim([0,1]);